# OpenCombine/OpenCombine

Open source implementation of Apple's Combine framework for processing values over time.

Repository: https://github.com/OpenCombine/OpenCombine
Canonical: https://ross.abutalabs.com/products/opencombine
Language: Swift
License: MIT
License Family: permissive
Topics: swift, combine, linux, macos, ios, watchos, tvos, reactive-programming, wasm, webassembly, windows, swift-package-manager, cocoapods
Last push: 2024-01-24T12:53:23+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 2640, "days_push": 952, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2797, forks 222 (observed 2026-08-28T04:07:22.434161+00:00)

## What it is
An open-source Swift implementation of Apple's Combine framework for reactive, value-over-time processing. It enables Combine-compatible code on older Apple OS versions and on Linux, Windows, and WebAssembly.

## Use cases
- use Combine-style reactive programming on Linux or Windows
- write Combine code for iOS apps supporting versions before iOS 13
- share reactive Swift code across Apple and non-Apple platforms
- run Combine pipelines in WebAssembly targets
- use Combine operators like debounce and receive(on:) with DispatchQueue schedulers
- bridge NotificationCenter and URLSession publishers through a Combine-compatible API

## When to choose
- you need Combine compatibility on platforms or OS versions where Apple's framework is unavailable
- you want a dependency-free reactive core with optional Foundation/Dispatch integrations
- you build cross-platform Swift apps and want one import (OpenCombineShim) that re-exports Combine where available

## When to avoid
- you target only macOS 10.15+/iOS 13+ and can use Apple's built-in Combine
- you need a full async/await or RxSwift-style ecosystem rather than Combine parity
- you rely on CocoaPods and need the OpenCombineShim module, which is SwiftPM-only

## Facets
- artifact type: library
- maturity: active
- function: state-management, concurrency, developer-tools
- domain: cross-platform, mobile-development, web-development, programming-languages
- platform: windows, wasm
- tags: combine, reactive-programming, swift-package-manager, cocoapods, reactive, publishers-subscribers, apple-framework-reimplementation, macos, ios, linux, swift

## Member repositories
- OpenCombine/OpenCombine (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:22.434161+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T08:14:39.349841+00:00, confidence not recorded.
  - readme: https://github.com/OpenCombine/OpenCombine (fetched 2026-08-28T04:07:22.434161+00:00, sha 7d5fb80a3cc7)
- Data as of 2026-08-30T08:39:29.467469+00:00.